Today, the loss of many qualified twentieth century buildings and the scarcity of studies for conservation of these buildings indicates the need for researches on this topic. In that respect the subject of the thesis study is to prepare a conservation proposal for the case Atat&uuml / rk Orman &Ccedil / iftligi Hamami, which was designed by an important architect of the Republic period buildings architect Ernst Egli in 1937s a part of a complex with Beer Factory and its mass housing. The building couldn&rsquo / t keep up within the transformation of the site and lost its function. Today the building is away from attention and under danger of destruction due to several material and structural problems. As a milestone project of modernization of a nation, Atat&uuml / rk Orman &Ccedil / iftligi&rsquo / s important role on the community, with its recreation areas and industrialization of agriculture has also been evaluated in the study and the building is studied as a whole with its close environment. In that respect a new function is proposed that will help the transformation of site in a positive manner together with considering the problems and the values of the building. By this way the building existing situation is documented, the values and problems are revealed out by systematic methods / and with proposed new function a conservation project that fore seen to reveal the importance of the building, preserve it by using and pass inheritence to next generations.